Distance between cities › USA › South Dakota › Dewey, SD › Distance from Dewey to Sinai Book Hotels

Distance from Dewey, SD to Sinai, SD

Distance

454 mi

Time

8 hours 30 mins

Gas Cost

$41 - $79

There are 351.93 miles from Dewey to Sinai in east direction and 454 miles (730.64 kilometers) by car, following the I-90 and US-14 route.

Dewey and Sinai are 8 hours 30 mins far apart, if you drive non-stop .

This is the fastest route from Dewey, SD to Sinai, SD. The halfway point is Vivian, SD.

Please note the time difference between Dewey, SD and Sinai, SD is 1 hour. The current time in Dewey is 4:42 am and the current time in Sinai is 5:42 am.

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Lowest Price Rental Cars in Dewey, SD

Planning on renting a car to go from Dewey, SD to Sinai, SD? Here there are some offers to rent a car in Dewey, SD

Small

From $14

Intermediate

From $18

Full-size

From $24

SUVs

From $28

Vans

From $40

Compare rental car prices in Dewey »

Gas Consumption and Emissions

A car with a fuel efficiency of MPG will need 18.24 gallons of gas to cover the route between Dewey, SD and Sinai, SD.

The estimated cost of gas to go from Dewey to Sinai is $57.18.

During the route, an average car will release 357.34 pounds of CO₂ to the atmosphere. The carbon footprint would be 0.79 pounds of CO₂ per mile.

Average USA gas price used for calculation is $3.14 per gallon of regular gas. Price last updated on March 12, 2026.
Read more about our CO₂ calculation.

Halfway Point Between Dewey, SD and Sinai, SD

If you want to meet halfway between Dewey, SD and Sinai, SD or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 43.911644 and -100.251213, or 43º 54' 41.9184" N, 100º 15' 4.3668" W. This location is 227.08 miles away from Dewey, SD and Sinai, SD and it would take approximately 4 hours 15 mins to reach the halfway point from both locations.

Closest City or Town to Halfway Point

The closest town to the halfway point is Vivian, SD, situated 248 miles from Dewey, SD and 243 miles from Sinai, SD. It would take 4 hours 11 mins to go from Dewey to Vivian and 3 hours 29 mins to go from Sinai to Vivian.